Application of a pilot study to the development of an industrial hygiene sampling strategy.
Petersen-MR; Sanderson-WT; Lenhart-SW
Am Ind Hyg Assoc J 1986 Oct; 47(10):655-658
A pilot study was performed to calculate the number of jobs and the number of subjects per job for which respirable dust samples needed to be collected during the personal sampling phase of the Cement Workers Morbidity Study. Selected workers were requested to wear a respirable dust sampler operating at a flow rate of 1.7 liters of air per minute; gravimetric analyses were used in calculating weighed exposures in mg/m3. Estimated variance components for job, subject and error were obtained by Henderson's model, which requires obtaining observed and expected sums of squares for each variable and solving for components of variance by three equations in three unknowns. It was found that only the components for job and random error were important and that subject to subject variability could be ignored. According to the results obtained, it was evident that fewer samples were needed than previously was believed necessary, which resulted in significant savings in time and resources. The authors conclude that although there is no single best way to interpret the data, it seems reasonable that the statistical analysis of a pilot study of this nature could be advantageous for studies in which dust sampling must be performed.
Epidemiology; Dust-sampling; Dust-control; Industrial-dusts; Air-samplers; Cement-industry; Occupational-health; Humans; NIOSH-Author
American Industrial Hygiene Association Journal